Just check some C2 built-in templates. There is a flappy bird clone with horizontal movement, so you can do it based on this one. But I think there is vertical one as well.
Yes, there is some demos and i see some of them but with all the them you feel like the blocks are coming and in my game i want to feel that im who is going up to the top...
A feeling like if you have all the blocks in the world where you can jump but all the blocks are being create once you are close enough to create.